Radiating crystals of brown stevensite. Under longwave UV light it shows some light brown fluorescence: not the typical bright, saturated fluorescence of other minerals, but clearly there.
Manuel Robbins in his book "Fluorescence. Gems and Minerals under Ultraviolet Light" report its fluorescence saying:
"Stevensite is fond in the trap rocks in the New Street quarry in Paterson, New Jersey, as an alteration of a previous mineral, probably pectolite. The fluorescence is white to yellow under short- and long-wave ultraviolet."
This piece is from Fort Lee, Bergen Co., New Jersey, a different, but close by, locality.
5.5 x 2.5 x 1.5 cm, 27.1 g.
![](https://static.wixstatic.com/media/da2329_6ad0dd28092049b4a9c6d4b19276600a~mv2.jpg/v1/fill/w_147,h_74,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/da2329_6ad0dd28092049b4a9c6d4b19276600a~mv2.jpg)
Longwave fluorescence.
![](https://static.wixstatic.com/media/da2329_a9b0369a70524fe8b21c3ac6489c731f~mv2.jpg/v1/fill/w_147,h_74,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/da2329_a9b0369a70524fe8b21c3ac6489c731f~mv2.jpg)
Normal light.